diff --git a/modoboa/admin/management/commands/subcommands/_mx.py b/modoboa/admin/management/commands/subcommands/_mx.py
index d1a01644e..853ac2558 100644
--- a/modoboa/admin/management/commands/subcommands/_mx.py
+++ b/modoboa/admin/management/commands/subcommands/_mx.py
@@ -82,7 +82,7 @@ class CheckMXRecords(BaseCommand):
                 #result from dnsbl is in ipv4 format
                 splited_result = result.split(".")
                 if int(splited_result[-1]) <= 15:
-                    #Typical dnsbl result : 127.255.255.[1-15] (depends on services)
+                    #Typical dnsbl result : 127.0.0.[1-15] (depends on services)
                     result = False
             except socket.gaierror:
                 result = False